Add GitHub Actions additional platforms to test

.github/workflows/ruby.yml

@@ -14,28 +14,29 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
+        os: [ubuntu-latest, ubuntu-20.04, macos-latest, macos-13, macos-12, windows-latest, windows-2019]
         ruby: ['3.0.7', '3.1', '3.2', '3.3']
 
     steps:
       - uses: actions/checkout@v3
+
       - name: Set timezone on Linux
-        if: matrix.os == 'ubuntu-latest'
+        if: contains(matrix.os, 'ubuntu')
         run: sudo timedatectl set-timezone 'America/New_York'
 
       - name: Set timezone on macOS
-        if: matrix.os == 'macos-latest'
+        if: contains(matrix.os, 'macos')
         run: sudo systemsetup -settimezone America/New_York
 
       - name: Set timezone on Windows
-        if: matrix.os == 'windows-latest'
+        if: contains(matrix.os, 'windows')
         run: tzutil /s "Eastern Standard Time"
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
-          bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+          bundler-cache: true
 
       - name: Update RubyGems
         run: gem update --system

Gemfile.lock

@@ -160,6 +160,7 @@ PLATFORMS
   x64-mingw-ucrt
   x64-mingw32
   x86_64-darwin-19
+  x86_64-darwin-20
   x86_64-darwin-21
   x86_64-linux